package com.cuit.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.cuit.reggie.common.BaseContext;
import com.cuit.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * 验证用户登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //进行路径比较(路径匹配器)
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}",requestURI);

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/backend/page/login/login.html",
                "/common/**",
                "/user/login"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        //3.如果不需要处理
        if (check){
            log.info("本次请求:{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4.判断登录状态，登录则放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户ID:{}",request.getSession().getAttribute("employee"));

            Long empID = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empID);

            filterChain.doFilter(request,response);
            return;
        }

        //手机用户登录验证
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，id:{}",request.getSession().getAttribute("user"));

            Long userId = Long.parseLong(request.getSession().getAttribute("user").toString());
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("未登录");
        //5.如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


    /**
     *  路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
